package com.ydj.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.ydj.reggie.common.BaseContext;
import com.ydj.reggie.common.R;
import com.ydj.reggie.entity.ShoppingCart;
import com.ydj.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

/**
 * @author ydj
 * @version 1.0
 */
@RestController
@RequestMapping("/shoppingCart")
@Slf4j
public class ShoppingCartController {

    @Autowired
    private ShoppingCartService shoppingCartService;

    /**
     * 添加购物车
     * @param shoppingCart
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车数据: {}",shoppingCart);

        //设置用户id，指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        //查询当前菜品或套餐，是否在购物车中
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,shoppingCart.getUserId());
        if (dishId!=null){
            //添加到购物车的是菜品
            queryWrapper.eq(ShoppingCart::getDishId,shoppingCart.getDishId());

        }else {
            //添加到购物车的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);
        if (cartServiceOne!=null) {
            //如果已经存在，在原来数量基础上加1
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number + 1);
            shoppingCartService.updateById(cartServiceOne);
        }else {
            //如果不存在，则添加到购物车，数量为1
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }
        return R.success(cartServiceOne);
    }

    /**
     * 查看购物车
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list(){
        log.info("查看购物车...");
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        queryWrapper.orderByAsc(ShoppingCart::getCreateTime);
        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);
        return R.success(list);
    }

    /**
     * 清空购物车
     * @return
     */
    @DeleteMapping("/clean")
    public R<String> clean(){
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        shoppingCartService.removeById(queryWrapper);
        return R.success("清空购物车成功");
    }

    /**
     * 减少购物车菜品或套餐数量
     * @return
     */
    @PostMapping("/sub")
    public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart){
        log.info(shoppingCart.toString());
        //设置用户id，指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        //查询当前菜品或套餐，是否在购物车中
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,shoppingCart.getUserId());
        if (dishId!=null){
            //是菜品
            queryWrapper.eq(ShoppingCart::getDishId,shoppingCart.getDishId());
        }else {
            //套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
        //查询出当前用户要删减的菜品或套餐
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);
        if (cartServiceOne.getNumber()>1) {
            //如果已经存在，在原来数量基础上减1
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number - 1);
            shoppingCartService.updateById(cartServiceOne);
        }else {
            shoppingCartService.removeById(cartServiceOne);
            cartServiceOne.setNumber(0);
            return R.success(cartServiceOne);
        }
        return R.success(cartServiceOne);
    }

}
